Rotary pump.



No. 762,539. PATENTED JUNE 14, 1904. W. H. d: G. W. LEIMAN.

ROTARY PUMP.

APPLImTloN FILED rms. 2, 1904.

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UNITED STATES Patented June 14, 1904'.

PATENT OEEICE.

TILLIAM H. LEIMAN, OF NEW YORl, N. Y., AND GEORGE WV. LEIMAN, OF

NEETARK, NEW JERSEY.

ROTARY PUMP.

SPECIFICATION forming part of Letters Patent No. 762,539, dated June 14,1904.

Application filed February 2, 1904. Serial No. 191,689. (No model.)

To all whom t may concern,.-

Be it known that we, WILLIAM H. LEIMAN, a resident of the borough ofManhattan, in the city and State of New York, and GEORGE W. LEIMAN, aresident, of Newark, in the county of Essex and State of New Jersey,citizens of the United States, have invented a new and useful RotaryPump, of which the following is a specification.

Our invention relates to a rotary pump, with the object in view ofproviding asimple, effective, and durable force-pump for general -usewherever it is required to employ a column of air as a forcing medium.

A practical embodiment of our invention is represented in theaccompanying drawings, in which- Figure 1 is a View of the pump in sideelevation, and Fig. 2 is a central vertical section in the plane of theline A A of Fig. 1.

rlhe casing of the pump is denoted by 1. It is of a general cylindricalform and is supported upon a pair of legs 2 3, terminating in feet 4 5,through which the casing may be bolted to the floor or other suitablesupport. The opposite ends of the casing 1 are provided with extensions6 7, within which the shaft 8 of the pump is journaled. The casing 1 isprovided at its periphery with an inletport 9, with which an inlet-pipe10 communicates, and with an outlet-port 11, with which a discharge-pipe12 communicates. We prefer to have the ports 9 and 11 communicate withthe interior of the casing 1 at points about diametrically opposite,although their particular position with respect to one another may bevaried as circumstances may require. The interior of the casing 1 iscylindrical in form, and the shaft 8 is located eccentrically withrespect to such cylindrical interior and carries fixed thereon Withinthe casing 1 a circular disk 13, having a length corresponding to thelength of the space between the opposite interior faces of the ends ofthe casing 1, so as to substantially form a closed joint between theends of the disk 13 and the opposite interior faces of the ends of thecasing, while permittingthe disk 13 to rotate therein. The disk 13 isprovided at intervals on its periphery lwith projections 14, in thepresent instance four in number and located a quadrants distance apart,the said projections having formed in their corresponding sides roundedsockets 15 for the seating of the vibrating pistons or wings. The outerface 16 of each of the projections 14 is curved to correspond to thecurve of the interior of the casing 1, and the distance of such curvedface from the axisv of the shaft 8 is such that when it reaches a pointon a radial line where the interior curved surface of the casing isnearest the vaxis of the shaft 8 the curved face 16 of the projectionwill be in close sliding contact with the interior of the casing 1. Inthe present instance this point is indicated as 17, i Fig. 2. Thesockets l5 are open in one direction through the side of the projection14; but the maximum diameter of the socket is greater than the openingthrough the side of the projection, so that when once the wings orpistons are placed in position with respect to the disk 13 and thelatter with its wings placed within the casing 1 the said pistons orwings are held against displacement with respect to the disk 13. Thewings or pistons are quite similar to one another and consist of acurved plate 18, the curve 19 on the inner face of the platecorresponding to the curve of the periphery of the disk 13, and thecurve 2O on the outer face of the plate corresponding `throughout thegreater portion of the length of the plate 18 to the curve of theinterior of the casing 1, but sharpened or made more abrupt, as shown at21 22, near the opposite ends of the plate, so that when the centralportion of the plate is in contact with the interior of the casing 1 theheel and forward ends of the said plate will recede from the interior ofthe casing, as clearly indicated at the right hand ofFig. 2. The wingsor pistons have at their heel ends cylindrical or rounded portions 23,which lit within the sockets 15 with an easy rocking motion, andintermediate the said cylindrical or rounded portions 23 and the body ofthe said wings or pistons the said wings or pistons are contracted, asshown at 24, forming a neck to permit the said wings or pistons to rockoutwardly away from the disk 13 and back toward the disk 13 into contactwith its periphery. Sockets 25 in the periphery of the disk 13 andcorresponding sockets 26 in the inner faces 19 of the wings or pistonsserve to house and retain the opposite ends of coiled springs 27, thetension of which is exerted to press the wings or pistons away from thedisk 13 into contact with the interior of the casing 1 and which alsoserve to cushion the inner thrust of the said wings or pistons under theaction of the interior of the casing 1 as the disk 13, with the wings orpistons thereon, is rotated. The free ends 28 of the pistons or wingsare made in planes which are slightly oblique to the radius of the disk13 and are intended to rest when the Wings or pistons are closed on thedisk 13 in close contact with the side of the projection 14 oppositethat through which the sockets 15 open.

In operation as the disk 13 is rotated by means of the shaft 8 in thedirection corresponding to the movement of the hands of a clock the airreceived through the port 9 between two consecutive wings will becarried forward to the exit 11 and forced out, the operation beingrepeated with each succeeding wing or piston.

It is important that the joint between the wing and the interior of thecasing 1 just be yond the discharge-port 11 shall be air-tight, as theback pressure through the pipe 12 or port 11, particularly when the pumpis used to force a column of air against an obstruction in a pipe toremove it from the pipe, may be great, and in order to make this jointeffective against leakage we have not only arranged the wing which haspassed the port 11 to contact throughout a considerable portion of itsextent with the interior of the casing just as it passes the port 11,but have further provided for carrying along between the body of saidwing and the projection 14, in which it is hinged in the space 29, asection of the compressed air in the port 11, which when the outer faceof the projection 14 comes in close contact with the interior of thecasing 1 incloses this compressed air, as in a pocket, making iteffective as an elastic packing past which the air from the port 11 mustgo as well as past the projection 14 and the body of the wing on theopposite side of said section of compressed air in order to escape. Thiswe find to be an exceedingly effective arrangement for keeping the jointtight and making the pump operate in an effective and economical manner.Furthermore, from the time the wing or piston is closed down intocontact with the periphery of the disk 13 until it passes the inlet-portits forward edge is held away from the interior of the casing 1, so thatit runs easily and without any tendencyto scrape; butas soon as it comesinto use `to force the air in advance of' it forward into thedischarge-port it has been rocked into a positlon so thatitsforwardouter edge will closely contact with the interior of the casing 1 andwill be held in such position by the outward pressure of the air inadvance of it, as well as by the spring, and so will prevent the airfrom escaping past it until its Work in forcing the air forward has beencompleted. The closing of the Wing toward the disk 13 gradually expelsthe compressed air from the heel toward the free end of the wing, sothat there is no compressed-air cushion finally left to prevent theclosing of the wing onto the disk 13, excepting such as may be containedwithin the spring-sockets, and this will serve a useful cushioningeffect rather than become a disadvantage. Itis also to be observed thatthe section of compressed air carried forward as a packing .between thebody of the wing and the projection to which it is hinged will be caughtby the next succeeding wing' and carried forward as a part of the chargeof air to be forced into the discharge-pipe 12.

It is obvious that the pump here shown and described might be used as asimple air or water circulating pump instead of a forcepump without anychange whatever in its construction, and we have further found that itserves well the purpose of a rotary engine by reversing the order andadmitting the steam or other motive fluid through the presentdischarge-pipe 12 and discharging the steam or other motive fluidthrough the present inletport 10.

What we claim is- 1. The combination with a cylindrical charnber havinginlet and outlet ports and a disk mounted eccentrically within thechamber and having its periphery spaced from the interior of saidchamber, the said disk being provided on its periphery with projectionsextended outwardly therefrom into position to form a closed joint withthe interior of the chamber in proximity to the outlet-port, of swingingwings or pistonshinged in the corresponding faces of the saidprojections to swing toward and away from the periphery of the disk, theouter faces of said wings or pistons being so curved as to form anextended contact with the interior of the cylinder for a considerabledistance after passing the outlet-port whereby a closed pocket is formedbetween the projection on the disk and the outer face of the swingingwing or piston immediately after the projection on the disk passes theoutletport thereby preventing the escape of fiuid between the said wingsand interior of the cylinder.

2. The combination with a cylindrical chamber having inlet and outletports and a disk mounted eccentrically within the said chamber andhaving its periphery spaced from the interior of said chamber, the saiddisk being provided on its periphery with projections extending outwardtherefrom into position to form a closed joint with the interior of thechamber in proximity to the outlet-port, of

IIO

throughout the space from the inlet-port to the outlet-port.

In testimony that we claim the foregoing as I 5 our invention we havesigned our names, in presence of two witnesses, this 30th day ofJanuary, 1904.

WILLIAM H. LEIMAN. GEORGE WV. LEIMAN.

Witnesses:

FREDK. HAYNES, C. Se SUNDGREN.

